//! Generated code for handling light client protobuf structs.

use zcash_primitives::block::{BlockHash, BlockHeader};

pub mod compact_formats;

impl compact_formats::CompactBlock {
    /// Returns the [`BlockHash`] for this block.
    ///
    /// # Panics
    ///
    /// This function will panic if [`CompactBlock.header`] is not set and
    /// [`CompactBlock.hash`] is not exactly 32 bytes.
    ///
    /// [`CompactBlock.header`]: #structfield.header
    /// [`CompactBlock.hash`]: #structfield.hash
    pub fn hash(&self) -> BlockHash {
        if let Some(header) = self.header() {
            header.hash()
        } else {
            BlockHash::from_slice(&self.hash)
        }
    }

    /// Returns the [`BlockHash`] for this block's parent.
    ///
    /// # Panics
    ///
    /// This function will panic if [`CompactBlock.header`] is not set and
    /// [`CompactBlock.prevHash`] is not exactly 32 bytes.
    ///
    /// [`CompactBlock.header`]: #structfield.header
    /// [`CompactBlock.prevHash`]: #structfield.prevHash
    pub fn prev_hash(&self) -> BlockHash {
        if let Some(header) = self.header() {
            header.prev_block
        } else {
            BlockHash::from_slice(&self.prevHash)
        }
    }

    /// Returns the [`BlockHeader`] for this block if present.
    ///
    /// A convenience method that parses [`CompactBlock.header`] if present.
    ///
    /// [`CompactBlock.header`]: #structfield.header
    pub fn header(&self) -> Option<BlockHeader> {
        if self.header.is_empty() {
            None
        } else {
            BlockHeader::read(&self.header[..]).ok()
        }
    }
}